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引言我厂设计的以日本产品“31 SX4B”为参考的高分辨率显象管是调制极接地的。各电极相对于调制极的典型工作电压如下(见图): 灯丝电压u_h=11伏第一阳极电压u_(α1)=110伏第二阳极电压u_(α2)=12千伏截止阴极电压u_κ=66伏如果忽略第二阳极电压对第一阳极的渗透,则放大系数为: μ=|(u_(a1K))/(u_(MK))|=|(u_(a1)-u_K)/(-u_K)|=0.67 (1)这个结果是不合理的,因为一般情况下放大系数总是大于1的。其主要原因是本管主透镜离发射系统不远,并且第一阳极孔径D比较大,主透镜的高压可能渗透到发射系统,影响截止电压u_K。本文介绍了用实验测量渗透、经过修
Introduction The high-resolution kinescope designed by our factory for the reference of Japanese product “31 SX4B” is extremely grounded. The typical operating voltage of each electrode with respect to the modulating electrode is as follows (see figure): filament voltage u_h = 11 volts first anode voltage u_ (α1) = 110 volts second anode voltage u_ (α2) = 12 kV cut-off cathode voltage u_κ = 66 volts If the second anode voltage is neglected to infiltrate the first anode, the amplification factor is: μ = | (u_ (a1K)) / (u_MK) | = | (u_ (a1) -u_K) / (- u_K) | = 0.67 (1) This result is not reasonable, because the magnification factor is always greater than 1 under normal circumstances. The main reason is that the main lens of this tube is not far from the emission system and the first anode aperture D is relatively large. The high pressure of the main lens may penetrate into the emission system and affect the cut-off voltage u_K. This article describes the experimental measurement of infiltration, after repair